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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 23:22 UTC on 3 Sept 2026, at a depth of 23 km, according to USGS.

Data: USGS · updated 2026-09-20 05:23 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
Depth
22.7 km
Status
Reviewed
Origin time
2026-09-03 23:22:27 UTC
Epicentre
52.238° N, 169.154° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
No towns within 400 km. This is a remote area.

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey2.7 ml22.7 km52.24° N, 169.15° W–Reviewed

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 169 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 23 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.7 releases about 32× the energy of M1.7, and its waves are about 10× taller on a seismogram. Energy: 169 kg of TNT vs 5 kg of TNT.

Each square is the energy of one M1.7. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

104 later earthquakes within 30 km; the largest was M4.9 23 days ago. 128 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

104 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.052.610
0.142.510
0.532.811
0.582.910
0.652.610
1.882.916
2.122.97
2.263.010
2.423.310
2.462.810
2.612.510
2.723.010
2.743.925
2.942.510
3.293.010
4.312.824
5.273.54
5.732.812
5.812.710
6.102.610
6.252.511
7.482.81
7.752.716
8.052.810
8.572.710
8.932.75
9.162.635
9.362.711
9.622.722
10.053.512
11.023.215
12.252.711
12.672.635
14.772.810
15.294.035
15.503.135
18.122.625
26.643.129
27.593.217
27.903.010
28.352.810
28.792.535
28.942.727
30.932.710
33.772.714
34.602.720
37.082.810
39.463.07
40.792.75
40.873.020
42.634.929
42.822.820
49.742.88
53.072.922
53.792.810
56.442.821
57.692.91
59.932.917
64.093.910
69.872.711
71.302.711
72.502.813
75.093.210
75.942.612
81.882.711
85.712.713
85.872.722
86.932.735
103.473.015
104.843.28
104.902.95
114.563.210
114.633.410
115.082.610
115.502.710
118.742.914
119.674.046
119.693.38
119.772.77
119.923.09
120.082.713
121.002.712
121.023.650
125.162.611
147.132.511
155.002.718
160.962.735
171.523.411
174.982.98
184.812.614
187.043.135
210.903.335
215.892.539
237.312.716
237.672.935
273.342.98
282.392.952
321.822.714
337.753.825
373.364.041
390.583.211
390.642.910
399.862.710
550.154.035
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 4.0Nikolski, Alaska09-08 23:02
  4. 4.0Nikolski, Alaska09-19 12:44
  5. 4.0Fox Islands, Aleutian Islands09-26 21:31
  6. 3.9Nikolski, Alaska09-04 02:06
  7. 3.9Nikolski, Alaska09-06 15:28
  8. 3.8Nikolski, Alaska09-18 01:07
  9. 3.6Nikolski, Alaska09-09 00:23
  10. 3.5Nikolski, Alaska09-04 04:38
  11. 3.5Nikolski, Alaska09-04 09:25
  12. 3.4Nikolski, Alaska09-08 18:00
  13. 3.4Nikolski, Alaska09-11 02:53
  14. 3.3Nikolski, Alaska09-04 01:47
  15. 3.3Nikolski, Alaska09-08 23:04
  16. 3.3Nikolski, Alaska09-12 18:16
  17. 3.2Nikolski, Alaska09-04 10:23
  18. 3.2Nikolski, Alaska09-05 02:57
  19. 3.2Nikolski, Alaska09-07 02:28
  20. 3.2Nikolski, Alaska09-08 08:13
  21. 3.2Nikolski, Alaska09-08 17:55
  22. 3.2Nikolski, Alaska09-20 05:57
  23. 3.1Nikolski, Alaska09-04 14:52
  24. 3.1Nikolski, Alaska09-05 02:00
  25. 3.1Nikolski, Alaska09-11 18:24

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id us7000tfxs. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000tfxs). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tfxs-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tfxs. SeismoAtlas is not an official warning service.